from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.exc import OperationalError
from config import MYSQL_CONFIG
from fastapi import HTTPException
import os
import base64


SQLALCHEMY_DATABASE_URL = MYSQL_CONFIG.DB_URI_SQL_ALCHEMY

# Get the base64 encoded certificate from the environment variable
ca_cert_base64 = os.getenv("CA_CERT_BASE64")

# Decode the base64 content
if ca_cert_base64:
    ca_cert_content = base64.b64decode(ca_cert_base64).decode("utf-8")

    # Write the decoded content to a temporary .pem file
    with open("/tmp/ca.pem", "w") as f:
        f.write(ca_cert_content)

    ca_cert_path = "/tmp/ca.pem"
else:
    raise ValueError("CA_CERT_BASE64 environment variable is not set")

# Use the decoded CA certificate in the SQLAlchemy engine
engine = create_engine(
    SQLALCHEMY_DATABASE_URL,
    connect_args={
        "ssl": {
            "sslmode": "REQUIRED",
            "ca": ca_cert_path,  # Path to the temporary CA certificate
            # Add other SSL options as needed
        }
    },
)

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


def get_db():
    db = SessionLocal()
    try:
        yield db
    except OperationalError as e:
        # Log the error and raise HTTPException for FastAPI
        print(f"An error occurred in get database sql alchemy.: {e}")
        raise HTTPException(status_code=400, detail="Database connection error")
    # Check if it's an authentication-related error
    except Exception as e:
        # Check if it's an authentication-related error
        if "401" in str(e):
            raise HTTPException(status_code=401, detail="Authentication failed")
        else:
            # For any other type of exception, raise a generic 400 error
            print(f"An error occurred: {e}")
            raise HTTPException(status_code=400, detail="An unexpected error occurred")